Electrical burglar-alarm.



W. K. COOK.

ELECTRICAL BURGLAR ALARM. APPLIGATIQN FILED AUG. 9, 1909.'

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WALTER E.. COOK-OF MINNEAPOLIS, MINNESOTA, ASSIGNOB. TO THE AMERICAN BANK PROTECTION COMPANY, OF MINNEAPOLIS, MINNESOT, A CORPORATION OF MIN- NESOTA.

ELECTRICL BUBGLAR-ALABM.

intense.

Speoicatlon of Letters Eatent.

application aaa august e, ieee. anal No. siaoea To all 'whom/t may concern:

Be it known that I, WAL'rnn K. CeoK, a citizen of the United States, and resident of Minneapolis, Hennepin county, Minnesota,

i `with an alarm mechanism located in an isolated protected housing, as distinguished from those systems in which the alarm mechanism is located at a central station where it is under the care or observation of a watchman.` A system of the class to which my invention belongs is shown in the patent to Clyde Coleman, Reissue No. 11,626, dated August 17, 1897.

'Ihe obJect of my invention is to provide a more eiicient system than any yet devised and one that cannot be tampered with in any Wa without sounding an alarm.`

o this end my invention consists enerall in the constructions and combinations hereinafter described and particularly pointed out in the claims.

The accom anying drawing, forming part of this speci cation is a diagrammatic view of a burglar alarm system embodying my invention.

In the drawing, A represents a bank-vault or guarded structure, and B a protected housin preferably located at a distance from t e guarded structure, and, in practice, usually arranged u on the outside wall of abank building, which contains the arded structure Orvault. The protected ousing, B, contains the main alarm. I usually employ, for this pur ose, an electrically operated ong 1, which will, when operated,

(if the lousing is located on the outside of the bank buildin arouse all the people in the neighborhood.

I have here shown the bank-vault or guarded structure provided with a suitable inclosing Wall 2, which is provided with an inner metallic lining 3, and an outer metallic lining 4, these linings being separated from each other by a sheet of insulating material 5. If these metallic linings are electrically connected, or short-circuited, in any manner, an electric circuit will be completed and all the alarms will be sounded as hereinafter described. I also prefer toy provide upon the vault wall two alarm gongs 6 and 7, protected by shields '8 and 9 so arranged that any attempt to move the shields, or to penetrate them with a metallic instrument, will also close an electric circuit and sound all the alarms, as hereinafter described.

'Ihe arran ement of the gongs 6 and 7 on theouter wa l of the vault, rotected by the shields 8 and 9, is prefera ly that shown and described in the patent of Robinson and Green, No. 708,496, dated September 2, 1902.

I may also provide the vault with a protection for its door by electrical connections to the door 10 and an insulated lining 11 thereon; and by electrical connections to the combination lock spindle 12, and the sliding bolt frame 13. I may also provide a timer 14, by which the door protection is switched od at the beginnin of business hours. Such mechanism, Jfor t ese purposes, as I prefer to use is shown and described in the patents of Robinson and Jacoby, No. 771,748 and No. 771,749, both dated October 4, 1904. The vault vestibule is also preferably provided with linings 15 and 16 separated by an insulating sheet 17. y

The guarded housing B is preferably in the form of a metallic box 1'8 having an insulated metallic lining 19, and a'removable cover 20 held in place by screws 2l which also serve to engage contact springs 22 and hold them out of engagement with contact plates 23. If an effort is made to enter the housing by removing any one of the screws 2l, a circuit will be closed and the alarms will be sounded.

I do not limit myself to the described form of barriers or circuit closers for the Vault or guarded structure and protected housing, nor do I claim any novelty in these devices per se. Any well known form of electrical barriers or circuit closers that will, when electrically connected, complete an elect-ric circuit, may be employed.

Within the vault, I preferably arrange three open circuit batteries 24, 25 and 26, and one closed circuit battery 27. For convenience I designate the open circuit batteries as the upper battery, the middle battery and the lower battery, respectively. I also preferably provide three automatic drops of circuit closers 29, 30 and l 31 which I designate the right-hand drop,

Vreleases a circuit-closing shutter 33. The

construction of the automatic circuit closers or drops that I prefer to employ is shown in' the atent to Robins No. 850,101, dated A ri 9, 1907.

e main alarm gong 1 is directly in circuit, by means of conductors 34, 35, 36, 37, 38, and 39 with the middle battery through the shutter or circuit closer 33 thatv is controlled by the middle dro 30.

A common Wire or con uctor ,40 connects the three drops. Conductor 41, 42 leads from the outer vault lining to the upper battery 24, and conductor 42 also extends to the right-hand shield and shield gong, and also to the draw bolt plate 13 on the vault `door vand is connected to the conductor 61,

which is in turn connected to the .lock spindle 12 andto the vault door 10, and through said door or the frame of thevault, to the outer vestibule lining 16. Conductor 45 eX- tends from the upper battery 24 to a small bell 50 Within thevault and connects with conductor 46 leading to the shutter of the right-hand drop and with conductor 48 leading to the bolt work of the vault door. From the lower battery, conductor 5l leads to the small gong 53 and, through conductor 52, to the shutter of the left-hand drop 31. The bells 5() and 53 are designed as test bells and by means of connections on the door (not shown) the circuits may be closed through these bells at any time for testing the batteries Without sounding a general alarm. The preferred arrangement for operating the test bells is that shown and described in the Robins and Jacoby Patent No. 771,749, hereinbefore referred to. The 1 left-hand shield and shield bell are connected primarily to the lower battery and left-hand drop through conductors 54, 55, 56, 57, 58 and 59. Conductor l60 connects the gong 53 with conductor 48. Conductors 61, 62, 63, 64, and 66 bring the open circuit barriers of the vestibule, door, door-lock, door-bolt and timer devices into circuit with the right-hand drop and upper battery. The circuit is traced from the carbon side of the upper battery through the extension toward the left of conductor 42, then through the draw bolt plate 13, or through the lock spindle 12, or through the door 10, Ior through the outer vestibule lining 16, and then from either o ne of these parts through any short circuiting device to the'opposite connection insulated therefrom. 'If the circuit has been closed by moving the draw bolt or manipulating the lock spindle, the current passes from t e draw bolt plate 13, or the spindle 12, through such insulated part to the conductors 62, and 63, thence through the* timer 14 to the conductor 66, thence through the conductor 67 andxthe conductor 44 to the coil of the right' hand drop '29, thence through the shutter 33 of said drop to the conductor 45 to the zinc side of the battery 24. If the short circuit is made by connecting the door 10 with the lining 1l, or by connecting the linirg ing`15, the circuit is trace from said lining 11 or 15 through the conductor 64 to the conductor 65, from the conductor 65 through the timer 14, to 'the conductor 66 and thence as before through the coils and shutter of the right hand drop to the zinc side of the battery 24. Conductors 44 and 54 are connected by a conductor 67. The casing of the outside or protected housing B, is connected to the upper battery 24, through the righthand drop 29, by`means of conductors 42 and 69', the covering 69 of the outside cable, outside casing 18, and lining 19, conductors 68, 67, 44, and coils 29, shutter 33 and conductors 46 and 45. If a short circuit is formed by connecting the casing 18 and the lining 19, or by connecting the covering 69 and the conductor 68, the vdrops 29,30 and 31 will be operated and a general alarm Will be sounded.

The main outside gong 1 is directly in cir- 'cuit with the middle battery through the shutter of the middle drop by means of con-v ductrs 34, 35, 36, 37, 33 and 39.

From the closed circuit battery 27, located in the vault, conductors 70 and 71 extend to the electro-'magnet or relay 72 in the protected housing B. The circuit, through the ymagnet 72, is normally closed, and the armature 73 is held normally out of engage- `ment With the contact (point. 81. Should this closed'circuit be cut or broken in any manner, the armature 73 Will be released and Will move against the contact point 81 and will close a local trip circuit from the battery 74, conductor 75, armature 73, conductor 82, coils of magnet 77 and conductor 76 back to battery. The relay magnet 77 Willl be energized and will attract the armature 78. This will release the shutter 79 which will drop into contact with the contact point 83 and a local ringing circuit will now'be closed from the battery 74 through conductor 76, conductor 80, shutter 79, conductor 39, the coils of the gong magnet, conductor 34, and conductor back to the bat- 16 with the lintery. When this local ringing circuit is closed, the gong 1 will begin to ring and will continue until the local ringing circuit is broken. lVhen the closed circuit has been restored to its normal condition and the armature 73 drawn against the magnet 72, the local ringing circuit may be broken and the parts restored to normal position by a person in the vault or guarded housing. For this purpose I provide a push-button 84 located in the vault and having one of its contact pieces electrically connected to the conductor 37. The other contact piece ot' the push-button lis connected to a conductor 85 which extends to an elcctro-n'lagnet 81' for which the shutter 79 forms an armature. A conductor 87 connects the coils of this magnet with the conductor 36 leading to the middle battery. By operating the pushbutton 84 a circuit is closed through the magnet 86 energizing the same and raising the shutter 79 and breaking the local ringing circuit. The shutter is engaged and held in its elevated position by the armature 7 8. l

Operation: When this apparatus is installed, ready for use, the vault or guarded structure. A is completely surrounded by the double lining consisting of the metal sheets 3 and 4, separated from each other by the insulating material 5. Each of the sheets 3 and 4 forms a part of an open electric circuit, which is closed whenever the sheets are brought in contact with each other, or when a metallic instrument is brought in contact with bothv of said sheets, as would occur in drilling or cutting through the vault. Open, electric circuit connections are also provided on the shield 8 and its connections, on the door 10, on the combination lock members, and on all other parts. of the vault which might be manipulated in an effort to enter it.' The guarded hous ing B, Which contains the main alarm gong, is preferably located at a considerable distance from the Vault, and the conductors extending from the vault or guarded structure A to the `uarded housing B, are arranged in a suitable cable and preferably inclosed by a cable covering 69. When any one of the open, electric circuits is closed, one of the drops 29 or 31 is operated and the corresponding shutter 33, is released-and in dropping closes the electric circuit through the battery, which remains closed until the shutter is restored to normal position by a person entering the vault and manually raising t-he shutter. Whenever one of the automatic drops 29 or 31 is operated, the magnet of the middle drop 30 is also energized, the path of the current being from either one of said drops 29 or 31 through the conductor 40, and back through the conductors 68, 67, and either one of the conductors connected to said conductor 67. When the coils of the drop 30 are energized the shutter 33 falls and this closes the main ringing circuit from the middle battery through the magnet of the gong 1 in the,

protected housing. This gong will continue to ring until the vault has been openedy and the shutter 33 has been manually restored to its normal position, thus breaking the ringing circuit. The circuits from the severa barriers of the vault or protected structure may be readily traced; for instance, assuming that the electric circuit is closed by bringing into electrical contact the inner and outer linings 3 and 4, which may he done in a numbei. of ways, as by drilling or cutting the lining, the circuit will be closed from the upper battery 24 through the conductors 42 and 41, to the outer lining 4, then through the connecting instrument to the inner hning 3,'then through the inner lining 3, then through the conductor 43 to the magnet of the drop 29, then through the shutter 33 and the conductor 45 to the other or zinc side of the upper battery 24. This circuit being completed the shutter 33 will drop and engage the contact point connected with the conductor 47. The circuit Will now be broken through the coils of thedrop 29, but Will be completed from the carbon side of the upper battery 24 through the conductor 42 to the frame of the right-hand ong 8 and back through the conductor 47, t 1e shutter 33, and the vconductor 46 to the other side of the battery 24. This will cause the right-hand gong 8 to rin from the upper battery 24 and this ringing will continue until the drop 33 is manually restored and the circuit last traced is broken. When the circuit is closed by connecting the lining 3 and 4, the circuit which energizes the coils of the drop 29 also energizes the coils of the drop 31 through the current liowing from the righthand or carbon side of t-he battery 24 through the conductor 42, conductor 41, lining 4, connection to lining 3, lining 3,

conductor 43, conductor 67, conductor 54,v

magnet coils of drop 31, conductor 40, shutter 33 of dro 29, conductor 45, to the left? hand side o the battery 24. The coil 31 being energized, the shutter 33 will fall, engaging the contact point to, said shutter which is connected to the conductor 57. The gong under the leftfhand shield 9 Will now be rungfrom the lower battery 26, the current passin as follows: from the righthand or car on side of the battery through the conductor 59, conductor 56, the gong Within the shield 9, conductor 157, shutter 33, conductor 52, conductor 51, to the left-hand side of the battery 26. This gong Will continue to ring until the shutter 33 is manually restored. In a similar manner, if any of the other barriers of the Vault, or its d oor, or of the guarded housing are brought in contact, one of the drops 29 or 31 vvill be .f

continuel to ring until the shutters 83 are manually restored and said ringing circuits are broken.

- the magnet 72 inthe outer or protected the amature 73 will befreleased and w11 be brought against` the` contact point' 81. The local circuit will-then be gong 1, the conductor 39,

closed from the battery 74 intheouter'housing as follows: through thejfgcodiilctor `75, the armature 73, the conductor.-82,=the coil of the magnet 77 and the conductor 7 6, back tothebattery74. Thecoil77bem ener ized will attract the armature 78 whic hol s up. the armature or shutter 79.y Thisshutter will then engage the contact point 83. A ringing circuit for the gong 1 through the battery 74 will then be established as follows: from the battery 74 through the conductor 75, the conductor 34 the coil of the the armature 79, contact point 83, conductor 80, conductor 76 to the battery 74. This circuit being closed, the gon will continue to ring until said circuit is broken. To break said circuit and restore the arts in the outer housing to normal con ition, the magnet 86 is energized from the middle battery 25 in the protected housing, by Vclosing the circuit with v a push button '84. The circuit which en- 35- conductor 87, coils o ergizes the magnet 86 is then traced from the battery 25 throu h the conductor 36, the magnet 86, the

conductor 85, ush button 84, conductor 37 to the other si e of the battery.25.

"It will be seen that the batteries Within the vault are four in number and consist of the three open circuit batteries, 24, 25 and 26, and the closed lcircuit battery 27. A

greater or less number of these batteries might be employed. As here shown the battery 24, w ich I have called the upper battery, furnishes the current for ringing the gong under the right-hand shield 8. It also furnishes the current for ringing the right-hand test bell of the switchboard when a general alarm is sounded, and acur rent for operating the drops when the vault protection, or the outside housing protection, is short circuited, or when t-he protection of the right-hand shield 8 is disturbed.

lThe battery 26, herein 4designated the llower battery, furnishes the current for ringing the gong under the left-hand shield 9, and the lefthand test bell 53, in case of a 'general alarm, and also for operating the rops when the protection of the left-hand shield is disturbed.

The battery 25, referred-to herein as the middle battery, furnishes the current for operating the outside alarmgong 1 in the event of ageneral alarm, unless the cable int leading to the outside alarm has been severed. If the cable has been severed the outside Ygon 1 will/ring from the local battery withn t e outside housin the relay of the local circuit' through t e battery being tripped by the cutting of the closed circuit e cable. The mlddle battery also furnishes current for energizing the magnet or relay 86, for the purpose of resetting the drop or shutter` 79, in case the local outside battery circuit is closed by the opening of the closed circuit in testing or otherwise.

The battery 27 furnishes the current for .the closed circuit which extends through the cable to the outside alarm and serves to hold the relay of this alarm normally out of action. In case this closed circuit is opened, either by cutting of the cable or otherwise, the outside relay is brought into action to close the local circuit through the battery, and the outside gong l. in the protected housing, thus ringing the gong notwithstanding the severing of the cable. v

The circuit from the middle battery tha is closed by the middle drop and extends directly to the gong l in the protected housing, I designate the main ringing circuit. The circuits from the upper and lower batteries through the right and left-hand drops to the gongs under the shields 8 and 9, .I designate the shield gong 'ringing circuits, and to distinguish one from the other, I refer to them as the right and left-hand shield gong ringing circuits. The circuits connected with the upper and lo`wer batteries and extendingy from the protective devices of the vault, or the protected housing, and all of which are kept normally open by suitable barriers, and any one of which, when closed, causes the tripping of either the right or the left-hand drop, and then of the central drop, and thereby the closing of the main ringing circuit, and also of the right and left-hand shield gong ringing circuits, I designate tripping circuits as the action of each of these circuits is to operate one of the drops and thereby to cause the sounding of a general alarm.

I claim as my invention:

1. An electrical bur lar alarm system, comprising, in combination, a guarded structure having, in its inclosing walls, suitable electrical conductors insulated from each other, a protected housing having inclosing walls comprising electrical conductors insulated from each other, a main alarm located in said protected housing, a suitable battery arranged within said guarded structure, an open ringing circuit, connecting said main alarm with said battery, open tripping circuits connected with the insulated conductors of the guarded structure and protected housing, an automatic drop within the guarded structure arranged t6 be operated when any one of said.tripping circuits is closed by electrically connecting the insulated conductors of the guarded structure or protected housing, and, when thus operated, closing said ringing circuit, a local alarm circuit arranged in said protected housing and including said main alarm, and a closed circuit extending from the guarded structure to the protected housing, and operating, when broken, to close the local alarm cir,- cuit in the protected housing.

2. An electrical burglar alarm system, comprising, in combination, a guarded structure having, in its inclosing Walls, suitable electrical conductors insulated from each other, a protected housing having inclosing walls comprising electrical conductors insulated from each other, a main alarm located in said protected housing, a suitable battery arranged Within said guarded structure, an open ringing circuit connecting said main alarm with said battery, a protected alarm located on the outer Wall of said guarded structure, an open ringing circuit connecting said alarm with said battery, open tripping circuits connected With the insulated conductors of the guarded structure and protected housing, automatic drops Within the guarded structure arranged to be operated when any of said tripping circuits is closed, and when `thus operated closing said ringin circuits, a local alarm circuit arran e in said protected housing and inclu ing said mam alarm and a closed circuit extending from the guarded structure to the protected housin and operating, when broken, to close the ocal alarm circult in the protected housing.

3. An electrical burglar alarm system,

comprising, in combination, a guarded structure having, in its inclosing Walls, suit,- able electrical conductors insulated from each other, a protected housing having inclosing Walls comprising electrical conducv tors insulated from each other, a main alarm located in said protected housing, a suitable battery arranged Within said guarded structure, an open ringing circuit connecting said main alarm with said battery,i open tripping circuits connected with the insulated conductors of the guarded structure and protected housing, an automatic drop within the guarded structure arranged to be operated when anyone Iof said tripping circuits is closed by electrically connecting the insulated conductors of the guarded structure or protected housing, and, when thus operated, closing said ringing circuit, a local alarm circuit arranged in said protected housing and including said main alarm, a magnet in said protected housing provided With an armature that serves, when released from the magnet, as a circuit closer for said local alarm circuit, a closed main circuit, 1ncluding said magnet, and extending from the guarded structure to the rotected housing and serving normally to old said armature out of circuit closing contact, and a battery in the guarded structure to which said closed main circuit is connected, substantially as described.

In witness whereof, I have hereunto setI my hand this 7th day of Au W K. COOK.

ALT Witnesses:

GEORGE W. STRONG, J. V. BYINe'roN. 

